What is the ceramic membrane?

26-04-2020

What is the ceramic membrane?



Ceramic membrane , also known as inorganic ceramic membrane, is an asymmetric membrane formed by inorganic ceramic materials prepared by a special process. Ceramic membranes are divided into two types: tubular ceramic membranes and flat ceramic membranes.

ceramic membrane





Inorganic ceramic membrane is a ceramic filter material with porous structure made of alumina, titanium oxide, zirconium oxide and other high-temperature sintering. The porous support layer, transition layer and microporous membrane layer are asymmetrically distributed. The filtration accuracy covers microfiltration, Ultrafiltration and nanofiltration.


ceramic membrane tube



Separation principle


The ceramic membrane separation process is a "cross-flow filtration" type of fluid separation process: the raw material liquid flows at high speed in the membrane tube, and the clarified permeate containing small molecular components penetrates the membrane in a vertical direction under the pressure drive The turbid concentrated liquid containing macromolecular components is retained by the membrane, so that the fluid can achieve the purposes of separation, concentration and purification.




Ceramic membrane elements are made up of a macroporous (>50 nm) inorganic material (with a tubular, multichannel, or monolithic geometry) supporting a multilayer porous ceramic structure exhibiting a non-deformable porosity with pore sizes ranging from macropores (>50 nm) to micropores (< 2 nm).



The medium to be filtered flows through the channels of the membrane carrier. Particles are retained if their size exceeds the radius of the membranes pores, building up the concentrate. The filtrate permeates through the pores and it is subjected to subsequent process stages.

ceramic membrane system







Applications



Initially, ceramic membranes were used in wastewater technology. Meanwhile, successful solutions and possible applications cover all industries where media were filtered.



Ceramic membranes feature:

  • Good chemical stability, acid, alkali and oxidation resistance;


  • Resistant to organic solvents and high temperatures;


  • High mechanical strength and good wear resistance;


  • Long life and large processing capacity;


  • Narrow pore size distribution, high separation accuracy, up to nanometer filtration;


  • Easy to clean, can be sterilized by online medicine or high temperature, and can be reverse washed.





Ceramic membranes offer significant advantages over polymeric or metallic membranes in many applications with extreme operating conditions because of their intrinsic properties i.e., rigid porous structure, high-temperature resistance, high-chemical resistance to aggressive aqueous and organic media, insensitiveness to biological attack.

ceramic membrane





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